| in the brain | 8 | location |
| after 3 or 4 doses | 5 | temporal |
| on perception | 4 | transitive-object |
| ketamine → have → effect | 9 |
| ketamine → take → effect | 8 |
| ketamine → have → significant effect | 5 |
| ketamine → exert → its effects | 3 |
| ketamine → do to have → this effect | 3 |
| negative | neutral | positive |
| 0.174 | 0.746 | 0.081 |
| Raw frequency | 28 |
| Normalized frequency | 0.646 |
| Modifier score | 0.800 |
| Perplexity | 210.660 |